From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E66CC4CECE for ; Sun, 15 Sep 2019 20:24:38 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2C39B214C6 for ; Sun, 15 Sep 2019 20:24:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Lromhxrg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2C39B214C6 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 943E96B0003; Sun, 15 Sep 2019 16:24:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8F3186B0006; Sun, 15 Sep 2019 16:24:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 808466B0007; Sun, 15 Sep 2019 16:24:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0169.hostedemail.com [216.40.44.169]) by kanga.kvack.org (Postfix) with ESMTP id 5B79A6B0003 for ; Sun, 15 Sep 2019 16:24:37 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id EEBC352A1 for ; Sun, 15 Sep 2019 20:24:36 +0000 (UTC) X-FDA: 75938282952.05.cub18_b2542bbb3e01 X-HE-Tag: cub18_b2542bbb3e01 X-Filterd-Recvd-Size: 2667 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf34.hostedemail.com (Postfix) with ESMTP for ; Sun, 15 Sep 2019 20:24:36 +0000 (UTC) Received: from sol.localdomain (c-24-5-143-220.hsd1.ca.comcast.net [24.5.143.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 125AD214AF; Sun, 15 Sep 2019 20:24:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568579075; bh=LCVK2aMgwTZJzb8J63CkOjhrW0RaVm+XZQ9QcWk8u64=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=LromhxrgzgBiWiRCWifYke78su7FoAeFk4hbabgMD3j1OY6I9lhHsv4j7lLe+hR8F IKDuRV1fnXI2+eGX1ZZ9vk4p1Uh1DSEbxGugPzhHZiCDEVAGazw+dCaOy9n9lxcf8I uSQcy/lO1NXYFgdb7hVEa77AxizYUGFADjSSyKTM= Date: Sun, 15 Sep 2019 13:24:33 -0700 From: Eric Biggers To: Janne Karhunen Cc: linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, Mimi Zohar , linux-mm@kvack.org, viro@zeniv.linux.org.uk, Konsta Karsisto Subject: Re: [PATCH 1/3] ima: keep the integrity state of open files up to date Message-ID: <20190915202433.GC1704@sol.localdomain> Mail-Followup-To: Janne Karhunen , linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, Mimi Zohar , linux-mm@kvack.org, viro@zeniv.linux.org.uk, Konsta Karsisto References: <20190902094540.12786-1-janne.karhunen@gmail.com> <20190909213938.GA105935@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.007646, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Sep 10, 2019 at 10:04:53AM +0300, Janne Karhunen wrote: > On Tue, Sep 10, 2019 at 12:39 AM Eric Biggers wrote: > > > Core file operations (open, close, sync, msync, truncate) are > > > now allowed to update the measurement immediately. In order > > > to maintain sufficient write performance for writes, add a > > > latency tunable delayed work workqueue for computing the > > > measurements. > > > > This still doesn't make it crash-safe. So why is it okay? > > If Android is the load, this makes it crash safe 99% of the time and > that is considerably better than 0% of the time. > Who will use it if it isn't 100% safe? - Eric